Identification of synthetic silicon carbide

1 Color nearly colorless to pale yellow, green and gray, domestic seen most of the sample gray-blue and gray-green.
2 Transparency and size: up gem crystal requirements.
3 crystal and optical properties: hexagonal, one-axis crystal optical properties.
4 Refractive index and dispersion degree: Synthetic high refractive index of silicon carbide, 2.65 ~ 2.69; with strong birefringence, and its bi-fold rate 0.043, synthetic silicon carbide dispersion degree is very large, is 0.104.
5 Thermal conductivity: Thermal conductivity of silicon carbide synthesized 116 ~ 418ca l? Cm ℃, the thermal conductivity of diamond 0155 ~
117ca l? Cm ℃, hence the thermal conductivity meter detects when the synthesis of silicon carbide with diamonds, a diamond reactions.
6 Conductivity: electrical conductivity meter testing, electrically conductive synthetic silicon carbide. In addition to the diamond? B-type, the other is not normally conducting various types.